I'm trying to re-keybind some of my function keys as I never use them for multimedia purposes, however I'm not sure as to what command I'd need to put it to increase/reduce the brightness, I'm talking about the command asked for below once you try creating your own custom shortcut:

Is there a standard terminal command to reduce the brightness (and increase it)? Ideally by a set percentage (10% for example), or alternatively a set value decrease which I'd need to find out from my hardware.

As extra information I can already control my brightness by pressing Fn+F7 and Fn+F8 to decrease and increase respectively but I'd like to be able to simply press F7 and F8 as its simpler. I'm also using Ubuntu 12.04 with Unity if it changes anything.

As requested by iSeth below, output of xmodmap -pke | less (keycodes 66-77 are the Function buttons, apologies for large wall of terminal output):

Edit: Stumbled across a relevant question and thought that one of the solutions of "How can I change brightness through terminal?" could work with my laptop but none did, I'm running a HP Pavilion DV6000 and I forgot to mention I'd prefer being able to run a command without needing root access if possible.

As for using xdotool it changes the stated brightness here:

But the screen remains at the current brightness so doesn't affect the hardware related to brightness in my case.

@Usingtotti I get the following output for dbus which makes me think it doesn't work in my case: method return sender=:1.4 -> dest=:1.153 reply_serial=2 uint32 30 otherwise the xdotool method makes the brightness levels stated in the top-right bar in unity change but the screen stays at the same brightness :(
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OyiboMar 31 '13 at 10:35

Both dbus and xdotool methods are working fine here with 12.10.
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desguaApr 1 '13 at 0:02

Save the file then run xmodmap .xmodmap. If the keys now do what you want, continue. If not delete the .xmodmap file from your home.

CONTINUED

Open startup applications from the dash. Click "Add". Put xmodmap .xmodmap in the command field. The other fields are optional, you can leave them blank. Click "Add" again. This makes Xmodmap run at startup.

There is a brightness indicator that you can dowload http://codevanrohde.nl/wordpress/?p=128. It is the only solution I have found that works on my laptop. With it you can set up hot keys to control brightness, use your mousewheel or select from a drop down list in the indicator. I have replaced 'Fn' with 'Win+Alt' which is very similar for my hands and now I can also use it with an external keyboard!